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<br />Independent School District #623 <br />STS Project #95192- YF <br />March 20. 199 J <br />Page 3 <br /> <br />~~ <br /> <br />No PI D meter readings were detected ahove background levels. No fuel oil odors were <br />identified. Background levels for the PID meter were zero (0) HNU units. The PID results <br />are included on the boring logs enclosed with this letter. <br /> <br />Chemical Analysis <br /> <br />Two soil samples were collected for lahoratory analysis. Sample 8-7 (S-4) and Sample B-9 <br />(S-4) were collected between JO and 11.5 feet in soil borings 8-7 and 8-9. The samples <br />were analyzed for benzene. ethylbenzene. toluene. xylene (8ETX) and total petroleum <br />hydrocarbons (TPH) as fuel oil. <br /> <br />No concentrations of BETX or TPH exceeded laboratory detection limits. A copy of the <br />laboratory result and chain of custody form is attached to this letter. <br /> <br />Conclusions <br /> <br />No evidence of petroleum contamination was detected during the soil exploration. Although <br />the soil borings did not identify petroleum impacts. it does not guarantee that no <br />petroleum impacts exist. Releases at piping connections or at the fill pipes may have <br />occurred which were not identified. The age of the tanks makes them more susceptible to <br />corrosion failures of the piping and/or tanks. <br /> <br />General Qualifications <br /> <br />The analysis and conclusions submitted in this report are based upon data as presented in <br />this report. The report has been prepared in accordance with generally accepted <br />engineering practices to assist the owner in the evaluation of the site. No other <br />warranty. expressed or implied. is made. The scope of this report is limited to the <br />specific project and the locations described herein and our description of the project <br />represents our understanding of the significant aspects in reference to this site. <br /> <br />STS is pleased to be of service to you on this project. If you have any questions <br />regarding this leUer. please contact us at 559-1900. <br /> <br />Sincerely. <br /> <br />STS CONSULTANTS. LTD. <br /> <br />Xc ~ Jkz <br />.~/ . /'-" i ,I . <br />/ .' I :' I .:'. ' L- . <br />_ i(lvctt (~'. ...r-c ~i.-Yj.' <br /> <br />Leslie A. Stovrlng ( / <br />Assistant Project Scientist '.. <br /> <br />') <br />Ol J .; J) A:! <br />(J~~Y~('/zLV:/~,r <br />Robert L. DeGroot. P.E. <br />Principal Engineer <br /> <br />LAS/dj <br />Encs. <br />